Yekke, see Chazon Ish YD 2, 16(http://www.hebrewbooks.org/pdfpager.aspx?req=14334&st=&pgnum=21) and 28 (http://www.hebrewbooks.org/pdfpager.aspx?req=14334&st=&pgnum=25). Rav Kook compared the spirit of the times to a seductress (see Sanhedrin 26b Tosafot d”h hechashud) and advised a rav whose sons became communists to continue to love them and help them financially. He further stated that secularists are not fully knowledgeable about Judaism and thus oppose a mistaken idea of it (see Tzitz Eliezer 8,15 that they do not understand the seriousness of chillul Shabbat). See also Meshech Chochma on Devarim 22,4:
?? ???? ???? ???? ??’ ???????? ???? ????? ???? ?????? ????? ??? ?? ??? ?????? ?? ???? ?? ???? ???? ?????, ????? ???? ?? ???? ?????, ??? ??? ???? ???? ??? ??? ???? ????? ??? ????, ?? ??? ??? ?????? ?? ??? ?? ?????, ?? ?? ???? ?? ????? ??? ????? ??????, ?? ???? ??? ?????? ??? ?? ????? ?????? ???? ??? ??????? ????????, ?? ???? ?? ??? ???? ??, ??? ???? ????? ??? ???, ?? ?? ???? ????? ?? ??? ????? ???? ??????, ??? ??? ???? ????? ??”? ???? ????? ?”? ???? ??????, ??? ???? ????.
As for the murderer, there is a major difference between someone who is over on chukkim and someone who is over on mishpatim. What about someone wo does not keep Shabbat but is honest, gives tzedakka and refrains form lashon hara vs. someone who keeps Shabbat but is over on the others?